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Application of the heat balance for estimating the hydrogen dissociation rate constant on the tantalum surface

Application of the heat balance for estimating the hydrogen dissociation rate constant on the... Heat transfer between the surface of a heated wire and ambient gas within the framework of the two-step mechanism of heterogeneous dissociation of hydrogen is studied by the Direct Simulation Monte Carlo method. This mechanism includes four heterogeneous reactions and takes into account the occupancy of activation sites on the surface. Based on the heat balance analysis performed, a dissociation rate constant is proposed, which yields the values of the power spent on gas heating and heterogeneous reactions that coincide with experimental data. The influence of the dissociation rate constant on the occupancy of surface sites and also on the probabilities of dissociation, recombination, and adsorption due to particle-surface collisions is analyzed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Thermophysics and Aeromechanics Springer Journals

Application of the heat balance for estimating the hydrogen dissociation rate constant on the tantalum surface

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Publisher
Springer Journals
Copyright
Copyright © M.Yu. Plotnikov and E.V. Shkarupa 2021
ISSN
0869-8643
eISSN
1531-8699
DOI
10.1134/s0869864321040090
Publisher site
See Article on Publisher Site

Abstract

Heat transfer between the surface of a heated wire and ambient gas within the framework of the two-step mechanism of heterogeneous dissociation of hydrogen is studied by the Direct Simulation Monte Carlo method. This mechanism includes four heterogeneous reactions and takes into account the occupancy of activation sites on the surface. Based on the heat balance analysis performed, a dissociation rate constant is proposed, which yields the values of the power spent on gas heating and heterogeneous reactions that coincide with experimental data. The influence of the dissociation rate constant on the occupancy of surface sites and also on the probabilities of dissociation, recombination, and adsorption due to particle-surface collisions is analyzed.

Journal

Thermophysics and AeromechanicsSpringer Journals

Published: Jul 1, 2021

Keywords: Direct Simulation Monte Carlo simulation; atomic hydrogen; heterogeneous reactions

References